Radio tuning coil



Jan. 8 1924.

J. L. MCLAUGHLIN RADIO TUNING COIL Filed June 29, 1922 gwuentoz I L. McLaayZr'a Patented Jan. 8, 1924.

JAMES L. MOLAUGHLIN, OF NEW YORK, N. Y., ASSIGNOR,

NEW YORK, N. Y.

RADIO TUNING COIL.

Application flied June 29, 1922. Serial No. 571,606.

To (/7/ [P710722 2'1 may concern:

Be it known that I. JAMES L. McLAUoH- LIN, a citizen of the United States, residing at 259 \Vcst 45th Street.

New York and State of New York. have invented certain new and useful Improvements: in; Radio Tuning Coils; .and I do hereby declare the following to be a full, clear, and exact description of the invention, such 'as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to radio transmis sion, or wireless communication and is directed more particularly to a tuning coil whereby the receiving and transmitting sets are synchronized or adjusted as to wave length. I

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment ofthe invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawings forming a part of the application.

Figure 1 is a perspective view of a radio tuning coil embodying the invention,-

Figure 2 is an elevation thereof, and

Figure 3 is a top plan view.

Corresponding and to in the following description and dcsignatcd in the several views of the drawings by like reference'characters.

The numeral 1 -designates a hollow body of cylindrical form and constructed of insulating material such fibre. body 1 and is subdivided into sections which are electrically connected-by conductors 2 with contacts 3 grouped about the body 1 and equally spaced from one another. one terminal of the coil 2 is grounded by means of a wire 4 and the other terminal is elccin the county oflike parts are referred" as pasteboard or 1 A coil of wire 2 1s mounted upon the trically connected with a contact blade 5 attached to and carried by a rotary cap 6 fitted to an end of the body 1. \Vhile the contacts 3 may be of any construction, they are shown asfconsisting of ordinary paper fasteners, of heads and the shanks 3 of which are assed through the body 1 and'are clinche u on the inner side thereof. The contact bla e 5 consists of a metal spring and is adapted to engage any one of the contacts 3 to bring any required portion of the coil 2 into action when tuning the set. The antenna"? from the aerial connects with the contact blade 5. The detector as-shown comprises the usual crystal 8 and fine wire or cats whisker 9. The wires leading to the phones aredcsignated by the numeral 10.

The tuning of the set is effected by rotating the member 6 on the body 1 until the desired results are attained. The frictional contact between the parts 1 and 6 is suflicient which the contacts 3ure theto hold the part 6 in the required adjusted position.

What is claimed is:

tuning coil comprising a substantially cylindrical body mcm )cr. a coil wrapped peripherally about the body member. a top mem bcr on said body member, one of said mem bers being turnable with respect to the other member, contacts in insulated relation to the coil, said contacts having heads disposed ex teriorly of the body member and in a'row about the body member intermediate the coil and top member, a. contact blade carried by said top member for coaciingengagement with said heads, said contacts having securing shanks extending from the heads through and interiorly of' the body member, and conductors leading from the coil secured to the shanks interiorly of the body memher.

In testimony whereof I aflix my signature in presence of two witnesses.

JAMES L. McLAUGHLIN. W i tncsses h. YnNNnucoL'r, R. ACKERMAN. 

